A transcript of the secret in case anyone is curious what it had said:

"I find myself less interested in shipping teenagers and 20-somethings, the older I get.
I assumed it would be the same for writers, but I'm finding it significantly harder to find fic containing older characters. Have older writers just stopped writing, or are they writing about current teenagers?
It's rather depressing, realizing that you're starting to get too old for your 20+ year hobby."